We have a problem with our ospf configuration.
We have two area :
area 0 is the wan area
R2 - R1 is the major tunnel link
R1 - R3 is an adsl spare tunnel link
area 1 is the local area
R2 R3 R4 are on the same local network.
Other lan network are behind R4.
R4 redistribute his lan network to R2 and R3
R2 and R3 redistribute his wan routes to R4
Does the routers R2 and R3 may be border router at the same time between two areas
How to configure it
Thanks for your help